Improvement in lightning-rods



REYBURN & MARTIN.

Lightning Rod. No. 96,268. Patented Oct 26, I869.

Z lz'inesses:

66-61% a WW I It. "Tins. mm WM 116.

waived soot agatwt @iiiiir.

WILLIAM S. REYllUllN AND I. J. MARTIN, OF PHILADELPHIA, PENNSYL- VANIA.

Letters Patent N 96,268, dated October 26, 1869.

IMPROVEMENT IN LIGHTNING-RODS.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom it may concern Be it known that \\"t ,v\ 1[-lll..\)[ ltnrncnx and F. J. MARTIX, of tho city and county of. Philadelphia, and State of llennsylrania, have invcntod a new and useful Improvement.- in lJigluniug-ltods; and we do hcrcby declare thatihct'ollowing is afull, clcar, and cxacn dcscription of the construction and operation of tho samc, rcl'crcncc luring had to thc accompanying drawings, making a part of this specification, in which the figure is a plan view of tho cud ot' the rod.

This invcntion is an inunovcment, upon the patcntgranted to \'crmilya, Rcyluu'n, and Huntcr, July 13, 186%); That patcnt was for a. rod formed of a copper covering upon :l.1't)llcd iron'centrc.

This invi-ntiou consists'in comhining aslmct-copper covering, constructed in a peculiar manner, with a shcct-zinc ccntrc, similarly (-ontrircd, whcncc certain adrantagcs result, as hcrcinal'tcr fully sct ibrth.

1n the drawings A is a lightning-rod, of thc kind produccd by Royburn and )[artins rial-forming machine, patented August 1?, 186%).

The rod A is made up ot'a shoot-zinc ccutrc, n, and a sheet-copper covering, I).

The supcriority ot' a shoot-zinc ccntrc orcr a rolled iron onc lics in this: that thc zinc, while. it afi'tu'ds, in connection with a copper (-orcring, suliicicntstrength for a first-class rod, costs ahont titty pcr ccnt. loss than iron; that it has twit-c tho powcr ot conducting cloctricity; that itis non-corrosivc; and that, when combined with copper as a covering, on tho introduction oi'sutiicicntmoisturc from tho atmosphere, thc earth, or rain, a. chcmical action is produccd, which goes toward the prcscrvati m of the coppcr, and increases the conductivity of thc rod, by producing a constant cur rent. of clcctricity.

The centre a andthe covering 1; are both formed of sheet-metal, doubled upon itself in ribs, as described md, is made of rolled iron, and this cannot be manufacturedinto a lightning-rod ccntrc so cheaply as shoot-zinc, as any innnulilcturer knows; and, ii'shcctiron wcrc used to form the same kind ot'ccntrc as thc Rcyhurn and Martin rod uses, it would be necessary to galvanize it, to prevent. oxidation, owing to the fact that the copper covering could not he applied to a shoot-iron centre in such a manner as to make it. water-tight, as the requisite prcssurc would injure thcribs.

Galvanized sheet-iron would be more costly than shoot-zinc, and in no respect superior.

Having thus describcd our invention,

Whatwe claim as new, and dcsirc to secure by Letters Patent, is-

As an article of manufacture, a section of lightningrod, COlllllOSUll of a shcct7.inc ccnnre, hcnt upon itself in webs, and acopper corcring, similarly formcd, substantially in the manncr aml for tho purpose dcscribed.

To the above specification of our ilnprovcmcnt, \vo ba-vc set ourhands, this 17th day of August, 1869.

WILLIAM S. REYBURN. l. J. MARTlN.

Witncsses Onas. A. PETTI'I, S. C. Knnos. 

